Is August 21 a rare birthday? Popular
More common than 84% of all 366 dates.
August 21 in numbers
The odds, the star sign and the other dates that come with it.
Where August 21 ranks
From most common birthday to rarest, August 21 ranks in position #58, with 11,381 births a year. 308 other dates are rarer. 51 dates are within 1% of its count, anywhere from #34 to #85, so the exact position is a close thing.
August 21 through the years
Where it ranked in the United States, year by year.
common
August 21 in other countries
August 21 is the 58th most common birthday in the United States. It is among the 50 most common in 3 of the 26 other countries, and ranges from #17 in Denmark to #315 in Argentina and Peru.
Denmark
#17 of 366
180 births on an average August 21
Statistics Denmark, 2007–2025Finland
#21 of 366
150 births on an average August 21
Statistics Finland, 2010–2025Latvia
#29 of 366
58 births on an average August 21
CSB, 1996–2025Germany
#56 of 366
2,195 births on an average August 21
Destatis, 2014–2025Japan
#64 of 366
2,893 births on an average August 21
e-Stat, 1996–2025Costa Rica
#70 of 366
176 births on an average August 21
INEC Costa Rica, 2014–2024England & Wales
#73 of 366
1,827 births on an average August 21
ONS, 1995–2025Mexico
#75 of 366
5,338 births on an average August 21
INEGI, 2017–2023Netherlands
#95 of 366
516 births on an average August 21
CBS, 1995–2025Guatemala
#111 of 366
966 births on an average August 21
INE Guatemala, 2018–2024Norway
#115 of 366
162 births on an average August 21
SSB, 2011–2025France
#125 of 366
2,183 births on an average August 21
INSEE, 1998–2024Belgium
#126 of 366
331 births on an average August 21
Statbel, 1992–2025Chile
#126 of 366
696 births on an average August 21
DEIS, 1990–2017New Zealand
#153 of 366
158 births on an average August 21
Stats NZ, 1980–2023Slovenia
#167 of 366
53 births on an average August 21
SURS, 2000–2025Philippines
#170 of 366
4,464 births on an average August 21
PSA, 2006–2024Malaysia
#179 of 366
1,397 births on an average August 21
DOSM, 2000–2022Ireland
#180 of 366
168 births on an average August 21
CSO, 1980–2023Ecuador
#181 of 366
763 births on an average August 21
INEC, 2013–2023Portugal
#197 of 366
297 births on an average August 21
INE Portugal, 1980–2025Switzerland
#212 of 366
222 births on an average August 21
FSO, 1969–2025Hungary
#237 of 366
323 births on an average August 21
KSH, 1970–2020Brazil
#260 of 366
7,721 births on an average August 21
DATASUS, 1997–2024Argentina
#315 of 366
1,383 births on an average August 21
DEIS, 2018–2023Peru
#315 of 366
1,129 births on an average August 21
INEI, 2019–2025
Famous people born on August 21
Ranked by how often people looked them up on Wikipedia last year.
Princess Margaret, Countess of SnowdonBritish princess · born 1930
Robert LewandowskiPolish footballer · born 1988
William IVKing of the United Kingdom from 1830 to 1837 · born 1765
Hayden PanettiereAmerican actress and singer · born 1989
Kim CattrallBritish and Canadian actress · born 1956
Wilt ChamberlainAmerican basketball player · born 1936
Usain BoltJamaican sprinter · born 1986
Sergey BrinAmerican computer scientist · born 1973August against the other eleven
August 21 is the 12th rarest of the 31 days in August. All August birthdays.
August is the 2nd most common month of the year
An average August day sees 11,405 births in the United States. September is the busiest month, January the quietest.
Quick answers
How many babies are born on August 21?
About 11,381 a year in the United States. It was at its most common in 2019, when 12,479 babies were born and it ranked #14 of 365; at its rarest in 2005, with 7,642 births at #319.
Is August 21 a common birthday?
In the United States, August 21 is the 58th most common of 366 dates, with about 11,381 births a year. That puts it among the more common birthdays.
What is the rarest August birthday?
In the United States, August 13: the 103rd most common of all 366 dates, with about 11,121 births a year. The most common August birthday is August 16, the 16th most common of the year.
How precise is the ranking?
In the middle of the calendar it is not exact. 51 other dates are within 1% of August 21's count, spread from #34 to #85, so the position inside that group would shift with a different set of years. That band is the accurate answer; the rank is the simple one. At the ends — Christmas Day, New Year's Day — nothing is close.
Is August 21 rarer in other countries?
In some. It is rarer in 22 of the 26 other countries we hold daily records for. It is at its rarest in Argentina and Peru, at #315 of 366, and at its most common in Denmark, at #17.
How this is counted
Every date is ranked by how many babies are born on it in the United States. Live births by day of birth from the CDC's National Center for Health Statistics, 1989–2024.
Updated October 2026